Abstract
Abstract Impedance spectroscopy measurements were carried out in the 10 Hz to 10 MHz frequency range from 500 to 1200 °C in LaAl 11 O 18 pellets sintered at 1600 °C. The powders were obtained by the polymeric precursor technique. The sintered pellets were nearly single phase LaAl 11 O 18 . The bulk electrical resistivity was evaluated from the [− Z ″( ω ) × Z ′( ω )] impedance diagrams. The value of the activation energy for the ionic conduction, 0.89 eV, was determined from the Arrhenius plot of the bulk conductivity. An yttria-stabilized zirconia (YSZ) oxygen pump and an YSZ oxygen sensor were used for providing 10–1500 ppm of partial pressure of oxygen ( p O 2 ) at 1000 °C for determining the electromotive force (emf) in a Pt/LaAl 11 O 18 /Cr 2 O 3 + Cr electrochemical cell. The results follow the Nernst law. The high signal-to-noise ratio of the emf at low p O 2 values shows that the LaAl 11 O 18 specimens may be used in sensors for detection of oxygen at high temperatures.
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